It's an arrow pointing to the upper right direction. It basically starts out a flat line, then curves upward and has arrow heads on the tip of it, giving the idea that were pointing to the upper right direction.

This is a Right Up 2 icon. We've made it in iOS style, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,300 icons, all in the same style and quality.